John joshua miller



J. J. MILLER.

COLLAPSIBLE CORE FOR MOLDING CONCRETE WALLS.

APPLICATION FILED JULY 29, 4919.

Patented Oct. 28, 1919.

JOHN JOS HUA MILLER, 0-]? LOS ANGELES, CALIFORNIA.

COLLAPSIBLE CORE FOR MOLDING CONCRETE WALLS.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed July 29, 1919. Serial No. 314,045.

To all whom it may concern:

Be it known that 1, JOHN Josnoa MILLER, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Collapsible Core for Molding Concrete Walls, of which the following is a specification.

This invention has reference to improve ments in forms for molding columns, walls, foundations, bridges, and the like, with hollow and ventilated walls, and comprehends an organization of sectional, interchangeable, and removable elements which may be expeditiously assembled to form core members, and which, when the concrete structure has been formed, may be readily removed for use upon a different section of the structure; it being a design of the invention to so relate the elements thereof, that the core members are light and durable, that they are provided with locking means, and that they may be manufactured at a low cost,

To attain these ends, the invention embodies a plurality of blocks having adjoining inclined faces and capable of being assembled into rectangular and symmetrical units, which may be supported between the outer mold forms as used in the construction of concrete walls.

Upon the annexed drawings, Figure l is a fragmentary and perspective view of outer concrete wall molds having my improved core units positioned therein having previously placed the plastic material therebetween. Fig. 2 is a side elevation of a core unit showing the wire binding elements thereon. Fig. 3 is a side view of the device with certain of the outer elements removed to show the central locking member. Fig. l is a top plan view ofacore unit. Fig. 5 is a bottom plan view of a core unit. Fig. 6 is a perspec-v tive view of an inner locking element having the integral locking rib. Fig. 7 is a perspec tive view of an inner locking element used with a detachable locking rib. Fig. 8 is a perspective view of a detachable locking rib. Fig. 9 is a perspective view of the central locking member. Fig. 10 is a fragmentary and side elevation of a detachable locking rib. Fig. 11 is a plan view of a wire binding element with the stay wires attached.

Referring to the drawings, my improved core unit consists of the outer wall elements- 21, substantially triangular in section and adapted to form the corners of the core unit when retained by the wire binding elements 22. The wire elements 22 may have the stay wires attached thereto, or may have other means of support (not shown). When the core units are removed, the wire elements 22 will remain in the wall embedded in the concrete. The two opposed locking elements 24 are provided with inner inclined faces 25, on the inwardly projecting ribs 26. The two opposed locking elements 27 are provided with detachable ribs 28, se cured with dowel-pins 29, adapted to engage with the holes 30 in looking elements 27. The detachable members 28 are pro-- vided with inclined faces 31, and are tapered so that the lower ends 32 are of lesser width than the upper ends 33. The central key member 34: is provided with four inclined faces 35, and rollers 36 mounted therein, to engage with the inclined faces 25 and 31, of members at and 28. The key member 3a is provided at the top end 37 with a recess 38, and a bar 39 transversely mounted therein.

In use, the members 21, 24, 27, 28, and the central key member 3a, are assembled as shown in Figs. 1, 2, 4:, and 5, to form individual core units. The core units are then placed between the mold forms which have been erected to form a concrete wall. Stay wires may be attached to the wire binding members, as shown in Fig. 11, and the core units may be then supported by the staywires.

When a section of concrete has been placed in the mold, the core members may be removed. To remove the core members, hook or pinch-bar may be placed in engagement with the member 39 in the top of each looking key, and the key member withdrawn from the core unit. Then the detachable rib members 28 are removed, the lower ends thereof being tapered to pass freely between the inclined faces 25, on members 24:. The members 27 are then removed, and lastly the members 21. The binding wires are left in the concrete which forms the walls of the structure being erected. When all core ele' ments are removed, the concrete structure is formed with hollow and ventilated walls, and a saving in the concrete material is effected. By this arrangement a concrete or cement wall may be erected, section by section, until the structure is completed.

It will be noted that this invention embodies a plurality of wedge elements, each interdependent upon the other to form an individual core unit, and wire binding elements adapted to retain the wedge elements in the assembled form. It is to be understood that any number of core units may be employed and so positioned within the mold forms, as to form a ventilated mold for a complete section of a wall.

lVhat is claimed is:

1. In a mold core, the combination with block elements constituting the corner members of a core unit, and wire binding elements determining the position of the block elements, of two opposed locking elements between adjacent block elements, integral ribs on said locking elements, and inclined faces on said ribs, opposed locking elements angularly disposed relative to the firstnamed lockin elements, detachable ribs on the last-named locking elements and inclined faces on said ribs, and a central key member having four angularly disposed and in clined faces, and adapted to be inserted between the locking elements with the inclined faces in engagement with the inclined faces of the locking ribs.

2. In a mold core, the combination with block elements constituting the corner members of a core unit, and wire binding elements determining the position of the block elements, of opposed locking elements disposed between the block elements. ribs projecting inwardly and extending longitudinally upon the locking elements, and a cen tral key member adapted to be inserted between the locking elements and in engage ment with the inwardly projecting ribs.

3. In a mold core, the combination with block elements constituting the corner members of a core unit, and means for holding the corner members in spaced relation to each other, of opposed locking elements disposed between the block elements, inwardly projecting ribs on the locking elements having inclined faces converging at the lower extremity thereof, and a key member adapted to engage with the projecting ribs and having a series of inclined faces corresponding with the inclined faces of the locking ribs.

at. In a mold core, a plurality of corner plates, a plurality of side plates alternating with the corner plates, a plurality of Wire binding elements serving to maintain the plates in relative position, locking ribs disposed upon the side plates and projecting inwardly therefrom, a central key member disposed between the locking ribs, and having inclined and recessed faces, and rollers mounted in the recesses and adapted to engage with said ribs.

In testimony whereof, signature this 24th 1919.

I hereunto aflix my day of July, in the year JOHN JOSHUA MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). C. 

